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Error 500 in messenger when PHP 8.0 turned on

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Hi, recently I updated my board to 4.7. I saw that I should change my PHP version from 7.4 to 8.0. As I did that everything to works fine except messenger. 

Msg in modal window are not loading and when I try to go to messenger there is an 500 error (no logs in ACP or I didn't find any). 

When I go back to PHP 7.4 messenger just starts to work again.

What should I do? How can I check what's cousing this issue?

I checked on PHP 8.0 with IPS requirements checker but it's not showing any warnings. 

Could contain: Text, Page, Word, Menu



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Do you have any modifications installed? One of those might be incompatible with PHP 8.0 since it changed how parent classes in theme hooks are handled.

Try disabling all modifications, switch to PHP 8 and see if the error is gone. If it is, re-enable the modifications 1 by 1 and check when the error appears again. After that contact the developer to let them know so that they can fix it.

Edited by teraßyte
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